A Digital Hygrometer for Trace Moisture Measurement

被引：61

作者：

Islam, Tarikul ^{[1
]}

Khan, Anwar Ulla ^{[2
]}

Akhtar, Jamil ^{[3
]}

Rahman, Mohammad Zia Ur ^{[2
]}

机构：

[1] Jamia Millia Islamia, Fac Engn & Technol, Dept Elect Engn, New Delhi 110025, India

[2] Jamia Millia Islamia, Dept Elect Engn, New Delhi 110025, India

[3] Cent Elect Engn Res CSIR CEERI, Council Sci & Ind Res, Sensors & Nanotechnol Grp, Pilani 333031, Rajasthan, India

来源：

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2014年 / 61卷 / 10期

关键词：

Capacitive sensor; hygrometer; interface electronics; modeling; sol-gel method; trace moisture; HUMIDITY SENSORS;

D O I：

10.1109/TIE.2013.2297295

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

A microcontroller-based digital hygrometer system using a low-cost moisture sensor in the range of 3.7-100 ppm has been developed. The sensor is of capacitive type and consists of nanoporous thin film of alumina (gamma - Al2O3) dip coated in between two parallel gold electrodes onto an alumina substrate. The behavior of the sensor has been modeled with an object to develop a signal processing circuit to convert capacitance change into frequency. The detection electronics circuit is based on a relaxation oscillator whose output is suitable for interfacing with a digital device. The sensor has been characterized with the circuit and then output frequency is calibrated in terms of ppm. The accuracy of the digital hygrometer when compared with the commercial dew point meter is found to be +/- 1 PPM.

引用

页码：5599 / 5605

页数：7

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